:root { 
    --white: #fff;
    --red: #FF0002;
    --flag-length: 12.8rem;
}

html, body {
    margin: 0;
    padding: 0;
}

html {
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.flag {
    width: var(--flag-length);
    height: var(--flag-length);
}

.flag-swiss {
    background-color: var(--red);
    display: grid;
    grid-template-columns: repeat(5, auto);
    grid-template-rows: repeat(5, auto);
}

.cross {
    background-color: var(--white);
}

/* Vertical bar */
.cross1 {
    grid-column: 3 / 4;
    grid-row: 2 / 5;
}

/* Horizontal bar */
.cross2 {
    grid-column: 2 / 5;
    grid-row: 3 / 4;
}